Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b7b98ab09f8638…

MALICIOUS

PDF

64.3 KB Created: 2020-11-23 11:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78923c6c43e908569ae832dda0d3ece5 SHA-1: e312b731456842e2fb56cacda96a80be58a5c1b8 SHA-256: d5b7b98ab09f8638b58c9697d85c2bee9fc59290307c2d6cb00c0fa0cc8637e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also flagging it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://traffnew.ru/123?utm_term=goth+boots+mens+12', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=goth+boots+mens+12
    • https://disinuxokisukoz.weebly.com/uploads/1/3/4/6/134610262/tobuna.pdf
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fb749354d1b5.pdf
    • https://nunigatomupava.weebly.com/uploads/1/3/4/3/134314222/2079653.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/77c24ad3e119c.pdf
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/6920468.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/13196c70.pdf
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/8421075.pdf
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/2622060.pdf
    • https://busixixadivuteg.weebly.com/uploads/1/3/4/7/134709325/gonodorewesi-bukop-valilu.pdf
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/dalimadek.pdf
    • https://suzibosefibowu.weebly.com/uploads/1/3/4/8/134883218/zigolobiwesu.pdf
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/xejofodewukemaluvedo.pdf
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/lotujegixofavevole.pdf
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/3039678.pdf
    • https://gubojipupulep.weebly.com/uploads/1/3/4/3/134359502/6048095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b381.bin
da634729419481f7b94ca688f452515273d2eff8fe6f76eba50f8b7d68806464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 4680 bytes
font_01_sfnt_off0000c347.bin
0f6a8ff409855a37fa0b10acb0f6c97c828b10a818c07e513ea42df7db427d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 10416 bytes
font_02_sfnt_off0000e6d6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 4324 bytes

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